文件输入输出 简单的文件压缩示例

 

#include
#include
#include
#define SIZE 40

int main(int argc,char *argv[]){
    FILE *ptrIn;
    FILE *ptrOut;
    char name[SIZE];
    int ch;
    int count = 0;

    if(argc<2){
        fprintf(stderr,"参数传输错误");//第一个参数用来指定输出的文件指针
        exit(-1);
    }
    if((ptrIn = fopen(argv[1],"r")) == NULL){
        fprintf(stderr,"打开读取文件错误");
        exit(-1);
    }
    strcpy(name,argv[1]);
    strcat(name,".red");
    if((ptrOut = fopen(name,"w")) == NULL){
        fprintf(stderr,"打开写入文件错误");
        exit(-1);
    }
    while((ch = getc(ptrIn)) != EOF){
        if(count%3 == 0){//打印三字符中的一个
            putc(ch,ptrOut);
        }
        count++;
    }
    if((fclose(ptrIn) != 0)||(fclose(ptrOut) != 0)){
        fprintf(stderr,"关闭文件错误");
        exit(-1);
    }
    return 0;
}

 

转载于:https://blog.51cto.com/fanaticssk/829265